Vulnerability Description
Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are logged locally, and an attacker might be able to compare them to timestamp data collected by the destination server (or collected by a rogue site within the Tor network).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Torproject | Tor Browser | <= 10.5.6 |
| Apple | Macos | - |
| Linux | Linux Kernel | - |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
References
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.mdExploitThird Party Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c6PatchVendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434Vendor Advisory
- https://sick.codes/sick-2021-111ExploitThird Party Advisory
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerabilityThird Party Advisory
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.mdExploitThird Party Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c6PatchVendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434Vendor Advisory
- https://sick.codes/sick-2021-111ExploitThird Party Advisory
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerabilityThird Party Advisory
FAQ
What is CVE-2021-39246?
CVE-2021-39246 is a vulnerability with a CVSS score of 6.1 (MEDIUM). Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are logge...
How severe is CVE-2021-39246?
CVE-2021-39246 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-39246?
Check the references section above for vendor advisories and patch information. Affected products include: Torproject Tor Browser, Apple Macos, Linux Linux Kernel, Microsoft Windows.